SC623ULTRT

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PMIC - LED Drivers

LED drivers are specialised power supplies that provide constant current or constant voltage to drive one or multiple LEDs. The SC623ULTRT is a ready-made solution from Infineon that addresses point-of-load applications, where dimming control and safety for high-power LEDs are essential. This article addresses the application field of the SC623ULTRT and explains its working principle.

Application Field of the SC623ULTRT

The SC623ULTRT is an advanced LED driver designed for interior lighting applications that require high accuracy, dimming, and robustness. It is a full-featured, easy-to-program, high-voltage LED driver that can be used in automotive headlamp, tail light, fog light, and sign illumination applications, as well as in residential, commercial, and industrial lighting applications. It is designed to drive high-power LEDs in parallel or tile string configurations.

The SC623ULTRT can be used in applications that require wide dimming control, from 0.1% to 100%. Its control range is extended to include analog linear control, 1-10V signal, DALI, and PWM dimming. Its integrated dimming range ensures smooth and flicker-free operation for long-term reliability and performance. The SC623ULTRT can also be used to drive multiple LED strings of up to 48V and up to 6A.

The SC623ULTRT is designed to ensure safe LED operation in both high and low temperature environments, and it can be adapted easily to different circuit topologies and power supplies. It is also designed to meet the requirements of the Automotive Electronics Council (AEC) Q100 standard and is suitable for automotive, avionic, and other demanding applications where quality, safety, and robustness are demanded.

Working Principle of the SC623ULTRT

The SC623ULTRT is designed to operate as a constant-current regulator, providing constant current regulation even in varying input voltages and temperatures. It is a PWM switched mode regulator with an internal USB port for programming. It utilizes peak current mode control with average current mode output to drive high-power LEDs with a wide range of dimming options. The start-up control and protection circuitry ensure safe and reliable operation of the LED.

The SC623ULTRT has a soft start circuit with a built-in reference voltage, enabling the LED to reach its full brightness gradually. The LED current is determined by a sense resistor, which is connected to the LED and the feedback pin of the SC623ULTRT. The output current is adjusted by setting the feedback voltage via the USB programming port, providing for easy and precise adjustment of the LED current.

The SC623ULTRT is designed to work with a wide range of power supplies, ensuring compatibility with standard automotive DC voltage sources. The internal hysteresis of the current limit helps prevent the LED currents from becoming too high. The LED current is adjustable over a wide range (0.1-6A) and is determined by the sense resistor and the feedback voltage.

The SC623ULTRT also features a built-in high-voltage, low-dropout protection circuit, which prevents the LED voltage from exceeding the supply voltage. This protection circuit is activated when the output voltage reaches a pre-set level and shuts down the device to avoid damage to the LED. It also includes overcurrent protection and overheating protection, ensuring that the LED is not damaged by excessive current or overheating.

The SC623ULTRT is an advanced, high-voltage LED driver that is designed for use in a wide range of applications where dimming control and safety for high-power LEDs are essential. Its advanced control and protection features ensure safe and reliable operation over a wide range of conditions, and its flexible programming options provide for wide dimming ranges. The SC623ULTRT is a versatile solution for applications where performance and reliability are of the utmost importance.

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